/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/Apache-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 *
 */


package com.tencent.angel.ml.math2.utils;

import java.util.concurrent.ForkJoinPool;

public class ForkJoinUtils {

  private static ForkJoinPool pool;

  public static ForkJoinPool getPool() {
    if (null == pool) {
      pool = new ForkJoinPool();
    }

    return pool;
  }

  public static int getNCores() {
    String ncoresStr = System.getenv("NUMBER_OF_CPU_CORES");
    if (ncoresStr == null) {
      return Runtime.getRuntime().availableProcessors();
    } else {
      return Integer.parseInt(ncoresStr);
    }
  }
}